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Ann Thorac Surg 1997;64:1263-1268
© 1997 The Society of Thoracic Surgeons
Department of Cardiac Surgery, Royal Melbourne and Epworth Hospitals, University of Melbourne, Melbourne, Australia
Background. After beginning our use of bilateral internal thoracic artery grafts in 1985, we found the pedicled right internal thoracic artery grafts limiting, and expanded the application of the right internal thoracic artery by elective use as a free graft. We evaluated the results of patients having a free right internal thoracic artery (FRITA)-to-coronary artery graft as part of their coronary revascularization.
Methods. From 1986 to 1995, 1,454 patients had a FRITA graft. Preoperative characteristics included mean age, 58.8 years (range 29 to 84 years); non–insulin-dependent diabetes, 116 (8%); insulin-dependent diabetes, 7 (0.5%); left ventricular ejection fraction from 0.30 to 0.40, 159 (11%); left ventricular ejection fraction less than 0.30, 14 (1%); and unstable angina, 144 (9.9%). In 11 patients the FRITA was the only graft, in 1,443 a left internal thoracic graft was also used and revascularization completed with additional arterial and vein grafts. There were 3.3 ± 1.1 distal anastomoses per patient, the aortic clamp time was 49 ± 12 minutes, and bypass time was 69 ± 16 minutes. The FRITA was used to reach the circumflex marginal arteries in 718 patients (49.5%), posterior descending artery in 286 (19.7%), diagonal or intermediate in 172 (11.8%), left anterior descending artery in 119 (8.1%), right coronary artery in 115 (7.9%), and left ventricular branch of right coronary artery in 44 (3%). The proximal anastomosis was directly on the aorta in 1,441, other arterial graft in 8, and vein graft in 5.
Results. Operative mortality was 13 patients (0.9%); stroke occurred in 14 patients (1%) and myocardial infarction in 19 (1.3%). The peak creatine kinase myocardial isoenzyme serum level was 20.6 ± 13.6 IU/L. Complications included sternal infection in 18 patients (1.2%) and reoperation for hemorrhage in 23 (1.6%). Survival at 5 and 7 years, respectively, was 96% ± 2.1% and 94% ± 2.5%. In 71 patients with a FRITA studied at a mean of 41.5 ± 14 months postoperatively for recurrent symptoms, 67 FRITA grafts were widely patent (94.5%), 3 displayed a string sign, and 1 was totally occluded.
Conclusions. Use of the right internal thoracic artery as a free graft is safe and effective and allows greater flexibility in arterial coronary revascularization.
Related Article
Ann. Thorac. Surg. 1997 64: 1268-1269.
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